The extra story of "Flowers of Flowers" mainly tells the story of Ajin's parents, as well as the explanation of some doubts that are not explained clearly in Chinese.
Of course, it can also be read as an independent story. The introduction is as follows:
A girl who was sent to another time and space to repair the cracks in time and space accidentally traveled to a different world 50 years ago...
The honest, upright, warm-hearted young man, and the girl with a twisted, selfish and indifferent personality, they don't look like people who can become husband and wife, but they become a couple that everyone envies...
The copywriting is also incompetent, see for yourself